Automatic gas-shut-off valve.



S. SYAKAS.

AUTOMATIC GAS SHUT-OFF VALVE.

APPLICATION man MAR. 21. 1916.

1 1 86, 1 4:7 Patehted June 6, 1916.

25 21 a] 120 1 z 815 a? v i 2 2:25am] ]0- a; 26 If J2 ":;.;;I I 5 J6 7J2 3mm 54' fi-'yalzaa THE COLUMBIA PLANORAPfl c0.. WASHINGTON D CSTEPHEN SYAKAS, OF MASSENA, NEW YORK.

AUTOMATIC GAS-SHUT-OFF VALVE.

Specification of Letters Patent.

Patented June 6, 1916.

Application filed March 27, 1916. Serial No. 86,975.

To all whom it may concern Be it known that I, STEPHEN SYAKAS, a citizenof the United States of America, re siding at Massena, in the county ofSt. Lawrence and State of New York, have invented certain new and usefulImprovements in Automatic Gas-Shut-Oif Valves, of which the following isa specification.

This invention relates to new and useful improvements in automatic gasshut-off valves.

The primary object of the invention is to provide an apparatus readilyinserted in any gas supply line between the supply pipe and the gasconsuming apparatus adapted for closing the gas passage automaticallywhenever the gas pressure falls below a predetermined point or isentirely shut 011'.

A further object of the invention is the provision of a safety appliancefor employment with gas supplyapparatus, especially those utilizingnatural gas or other gas where the pressure in the mains is subject tofluctuations and interruptions, the apparatus being designed forautomatically closing the gas supply pipe and preventing a discharge ofthe gas until the appliance is manually reset.

A still further object is to provide a device for preventing injury byreason of escaping gas after a burner has been extinguished by reason ofa drop in the pressure or a suspension in the supply of the gas, thedevice automatically closing the supply pipe under such circumstances.

With these general objects in view and others that will appear as thenature of the invention is better understood, the same consists in thenovel combination and arrangement of parts hereinafter fully described,illustrated in the accompanying drawings and then claimed.

In the drawing forming a part of this application and in which likedesignating char acters refer to corresponding parts throughout theseveral views: Figure 1 is a central longitudinal sectional view throughthe device in its operative open position. Fig. 2 is asimilar viewthereof partly in elevation in its inoperative closed position, and Fig.3 is a view similar to Fig. 2, the device being illustrated in theoperation of resetti the same,

It will be understood that the present au= tomatic shut-01f for the gassupply may be positioned at any point in the supply pipe and the sameconsists broadly of a cylindrical valve casing 10 having a front head 11pro]ecting therefrom with a threaded terminal nipple portion 12 adaptedto be connected to the gas consuming apparatus such as the burnerconnecting pipes of a building, a casing 13 of a three-way gas cookbeing attached to a threaded boss 14 of the casing 10 and arranged witha supply connection 15 for attachment to the gas supply or inlet pipe(not shown) of the system.

The valve casing 10 is provided with a central chamber 16 thereinarranged with a closure cap or cylindrical back head 17 screw-threadedupon the casing and having a threaded boss 18 axially projectingtherefrom. A piston 19 is tightly fitted for reciprocating within thechamber 16 and has a piston rod or valve stem 20 slidably arrangedthrough a bore 21 connecting the chamber 16 with an axially arrangedvalve chamber 22 in the front head 11 of the valve casing. A valve 23 isattachedto the end of the valve stem 20 opposite the aforementionedpiston 19, the said valve adapted to close upon an annular seat 24L atthe in ner end of the valve chamber 22 when the piston is at the outerend of the piston chamber 16 in substantial contact with the closurehead 17. p A turn plug 25 is positioned in the casing 13 having atransverse main port 26 and a lateral auxiliary port 27, while a passage 28 is arranged through the casing 10 and boss 14 communicating withthe piston chamber 16 and the chamber 29 within the cock casing 13.

With the elements in their normal position, as illustrated in Fig. 1 ofthe drawing, the gas is supplied through the inlet 15 of the casing 13,the plug 25 being positioned with the port 26 thereof in communicationwith the passage 28 and whereby the gas enters the piston chamber 16 andby reason of the gas pressure maintains the said piston at the inner endof the chamber 16 and with thevalve 23 unseated and positioned outwardlyof the valve chamber 22. The gas then normally passes out through theaxial bore 30 of the piston rod 20, through a side port 31 in the saidrod and thence outwardly past the valve 23 to the putlet nipplel2 andthence through the service apparatus, such as the gas burners, notshown.

In the event of an interruption in the gas supply at the casing inlet 16or a reduction in the gas pressure, the piston 19 will lower by reasonof its own weight incident to the reduced fluid pressure in the chamber16 un til the elements assume their relations illus trated in Fig. 2 ofthe drawings with the valve 23 closed upon its seat 24, thus pre ventingany further outlet of the gas through the nipple 12.

Upon a renewal of the gas supply entering through the inlet 15, port 26,chamber 29 and passage 28, the gas will enter the chamber 16 above thepiston 19 and the pressure of the gas will more firmly seat the valve 23preventing any exit of the gas through the nipple 12, as illustrated inFig. 2 of the drawing. It will thus be evident that any burners that mayhave been extinguished when the gas was shut off by the lowering of thepiston 19 cannot now be in a position for gas to escape therethrough andbeing unlighted cause injury to persons and property.

A by-pass pipe formed of two sections 32 and 33 attached together by acoupling or union 31 provide a passage between the boss 18 of the pistonhead 17 and the casing 13 of the three-way cock so that the chamber 16is in communication with the chamber 29. For reestablishing fluidcommunication between the inlet 15 and outlet 12, the plug 25 is given aquarter turn so as to connect the auxiliary port 27 thereof with thecasing inlet 15 and the main port 26 with the by-pass pipe, asillustrated in Fig. 3 of the drawing. In this position, it will be seenthat the gas which has regained its full pressure passes through theplug 25, the by-pass pipe 3382 entering the chamber 16 beneath thepiston 19, forcing the piston upwardly returning the same to itsoperative station as shown in Fig. 1 with the valve 23 unseated from itsseat 24: and the device in its operative open arrangement. Any fluidtrapped within the chamber 16 above the piston 19 during the operationof the device is allowed to escape during the reopening of the valve 23by means of a longitudinal exteriorly arranged side groove 35 in thepiston rod 21 allowing such fluid to pass from the chamber 16 to thevalve chamber 22, all as fully illustrated in Fig. 3 of the drawing.WVhile the communication will thus be established through the bypasspipe, it is only necessary to employ such pipe for an instant during thereturn of the piston 19 to its normal valve unseating arrangement andwhereupon the plug 25 is returned for directly connecting the port 26with the piston passage 28 and closing the by-pass pipe 33, the devicebeing then operatively arranged for performing the functions for whichit is designed as hereinbefore specifically set forth.

The device is easy and inexpensive to manufacture, all the parts thereofbeing readily assembled and disconnected when desired, the device beingserviceable as a safety or precautionary means against injury byescaping gas as well as for effecting av saving of the gas supply.

While the form of the invention herein shown and described is what isbelieved to be the preferable embodiment thereof, it is nevertheless tobe understood that minor changes may be made in the form, proportion anddetails of construction without departing from the spirit and scope ofthe invention as hereinafter claimed.

WVhat I claim as new is 1. An automatic gas control apparatus comprisinga casing having a piston chamber therein, a head extending from the saidcasing and having a valve chamber therein provided with a valve seat,the said casing having an axial bore communicating with the said pistonchamber and the said valve chamber centrally of the said seat, aweighted piston within said piston valve, a tubular piston rod axiallysecured through the said piston slidably arranged within the said boreand having a side outlet port, a closure valve upon the outer end of thesaid rod arranged upon the said seat when the piston is in its loweredposition, the said casing provided with a fluid inlet passage, athreeway cock casing in communication with the 109 said inlet passageand having a supply connection, a turn plug in the said casing havingmain and auxiliary ports, a closure head for said piston chamberscrew-threaded upon the first named casing and a bypass pipe connectingthe said piston chamber with the interior of said cock casing.

2. A safety valve cut-off comprising a casing having a piston chamberand a valve chamber therein and a communicating bore between the saidchambers, a piston within the said piston chamber, a valve within thesaid valve chamber. a tubular connecting member having a side porttherethrough attached to the said piston and valve and slid ablyarranged within the said bore, the said. connecting member having alongitudinal side groove terminating adjacent the piston at its lowerend and adjacent the said port at its upper end, a valve casingcommunicating with the piston chamber, a bypass pipe between the lowerend of the piston. chamber and the said valve casing, and a three-wayported turn plug within the said valve casing.

3. An automatic gas shut-ofl apparatus comprising a piston casing havinga piston chamber therein, an axial bore through one side thereof andinlet passages arranged in planes perpendicular to each other in two ofthe other sides thereof, one of the said passages being in axialalinement with the said bore, a Weight closing piston Within the saidchamber, a tubular rod slidably arranged within the said bore attachedto the said piston and having an outlet port adjacent its free end, apiston controlled cut off valve on the outer end of the said rod, and athree-Way gas cock attached to the said casing in communication With thesaid inlet 10 passages and having a fluid supply connection.

In testimony whereof I aflix my signature.

STEPHEN SYAKAS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of linen", Washington, D. O.

